Spring-calk drive-shoe.



L. K. JOHNSON.

SPRING CALK DRIVE SHOE.

APPLICATION FILED MAY I2. 1915.

Patented Oct. 29, 1918,.

.r w g y Inventor Witnesses Attorneys l-IMTED gimme PATENT camps.

LORENZO K. JOHNSON, or PORTLAND, rENNsYLvANIA.

" Y ,srmNe-cALK pnrvn srron.

To all whom it may concern: 7

Be it known that I, LORENZO K. JoHNsoN, a citizen of the United States,residing at Portland, in the county of Northampton and State ofPennsylvania, have invented a new and useful Spring-Call: Drive-Shoe, ofwhich the following is a specification.

The device forming the subject-matter of this application is ahorseshoe, and the invention aims to provide novel means for holding acalk in place on the shoe.

The invention aims, specifically, to provide a horseshoe, the calkreceiving opening of which is crossed by a bridge which, coactingwiththe arms uponthe calk. expands the said arms into a flared portionof the opening.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the presentinvention appertains.

With the above and other objects in view which will appear as thedescription proceeds, the invention resides in the combina tion andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed can be made within thescope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawing Figure 1 shows in bottom plan, a horseshoeconstructed in accordance with the present invention;

Fig. 2 is a top plan of a horseshoe constructed in accordance with thepresent invention;

Fi g. 3 shows the shoe in side elevation;

Fig. 4 is a cross-section taken approximately on the line 4-4 of Fig. 2,one of the calks being in place; and

Fig. 5 is a section taken approximately on the line 4-4 of Fig. 2, thecalk being removed.

In carrying out the present invention there is provided a shoe 1equipped adjacent its toe with depending bosses 2 and provided adjacentits heels with depending bosses 3. Extended through the bosses 2 and 3,and through the body portion of the shoe, vertically, are openings 4which flare adjacent their upper ends as indicated at 5. Extended acrossthe openings 4 and located in the flared portions 5 thereof are bridges6 of blunted wedge-shape and comprising Specification of Letters Patent.

Application filed ma 12, 1915; Serial No. 27,649.

Patented net. 29, late.

downwardly extended, approaching walls 7. The calks 8 may be variouslyconstructed, so far as their ground-engaging ends are concerned, itbeing a matter of common knowledge that the calks will be sharpened orpointed to a greater or less extent depending upon the condition of theroadway to be traversed, the common practice being to use a duller calkin the summer season than in the winter, when the roadway is icecovered. In general, the calks 8 may be shaped as found expedient, sofar as their gripping functions are concerned. Each calk 8, however,embodies a tapered stem 9 defining a shoulder 10, the stem 9 beingbifurcated to form arms 11, and the shoulder 10 abutting against theunderface of theshoe when the calk is driven home in the opening 4. Thearms 11 coact with the inclined faces 7 of the bridge 6 and are forcedlaterally, and expanded into the flared portions 5 of the openings 4.

From the foregoing it will be seen that there is presented in thisapplication, a novel means whereby a calk may be securely assembled witha shoe, it being necessary merely to drive the calk to a firm seat, bymeans of a hammer or like tool, no other implements being necessary. Byreferring par ticularly to Figs. 4 and 5 it will be noted that thebridge 6 extends downwardly below the lower end of the flared portion 5of opening 4. Consequently, as shown in said figures, the lower ends ofthe passages between the bridge 6 and the walls of the flared portionsare of greater width than the free terminals of the arms of the calk.Thus when these arms are first inserted into the opening 4, their freeends will enter readily into the enlarged lower ends of thecalk-receiving spaces so that their insertion will not be resisted bythe bottom of the bridge 6.

Having thus described the invention, what is claimed is:

The combination with a horseshoe having an opening extending thereinto,the lower portion of the opening having its walls parallel and the upperportion of the opening being flared, and a bridge within the flaredportion of the opening and forming diverging passages of greater widthat their lower ends than at their upper ends, said bridge beingtrapezoidal in cross-section and the lower face of the bridgeconstituting a fiat thrust bearing located between the top and bottomfaces of the horseshoe, opposed Walls of the bridge overhanging thelower ends of said passages to constitute deflecting means, of a calkincluding a shank adapted to fit snugly Within the lower portion of theopening and to abut against the fiat thrust bearing of the bridge, andarms extending from the shank, the free ends of the arms beinginsertible into the enlarged lower ends of the passages, said 10 bridgeconstituting a seat for the calk.

In testimony that I claim the foregoing as my own, I have hereto aflixedmy signature in the presence of two Witnesses.

LORENZO K. JOHNSON. Witnesses :1 7

War. -.I; ITRAUSUL,

ose sv. SANDT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 03-

